in tetrahydrofuran (Ar) addn. at -78°C, stirring at this temp. for 30 min, transfered to a solution of H2O in THF, warmed to -30°C for 30 min, cooling to -78°C; analyzed by gplc, mass spectrum;

in diethyl ether (Ar) addn. at -78°C,warming to -30°C, warming to 25°C; NMR;

in tetrahydrofuran (Ar) addn. at -78°C, stirring at this temp. for 30 min, transfered to a solution of H2O in THF, warming to 25°C; solvent was removed under vacuum, purification by gplc, elem.anal.;